North Korean leader Kim Jong Un said the country's production capacity for weapons-grade nuclear materials has more than doubled during the past five years, as he inspected a newly operating nuclear materials production facility, state-run media said Thursday.During his visit on Wednesday, Kim was informed of the facility's long-term production plan and called for the strengthening of the country's nuclear forces at an "exponential rate," the official Korean Central News Agency said.A photo released at the same time showed the new plant equipped with many centrifuges used to enrich uranium.…READ FULL ARTICLE